oil change and coolant change - JeepForum.com
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post #1 of 8 Old 10-19-2007, 11:20 AM Thread Starter
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1999 WJ 
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oil change and coolant change

Hey guys,

once again i am needing some help. I am changing the oil and coolant on my 99 laredo. i have drained it of oil and changed the filter. the only prob now is i cant get the oil fill cap off Is there a certain nack to this cap and not like other cars that just twist off this brings me to my next question...how do you get the coolant to drain. i opened the bottle fill cap and then turned the drain on at the bottom of the rad...NOTHING honestly i am stumped. Lastly, after this is done, how do i get rid of the 'PERFORM SERVICE' light from showing and beeping?


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post #2 of 8 Old 10-19-2007, 11:51 AM
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For the engine oil make sure that the engine is cool

Taken from my manual
Use this procedure if the entire cooling system is to
be drained, such as for engine removal.
(1) DO NOT remove radiator cap first. With engine
cold, raise vehicle on a hoist and locate radiator
† 4.0L 6-cyl. Engine: Radiator draincock is located
on the right/lower side of radiator facing to rear of
† 4.7L V-8 Engines: Radiator draincock is located
on the left/lower side of radiator facing to rear of
(2) Attach one end of a hose to the draincock. Put
the other end into a clean container. Open draincock
and drain coolant from radiator. This will empty the
coolant reserve/overflow tank. The coolant does not
have to be removed from the tank unless the system
is being refilled with a fresh mixture. When tank is
empty, remove radiator cap and continue draining
cooling system.

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SOLD '99 WJ I6 | Claytons LA | 6.5" | HP D44 | F9" | 35's
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post #3 of 8 Old 10-19-2007, 11:53 AM Thread Starter
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thanks eshindi but i have done all of that and still nothing. the oil cap is making a clicking noise like it is child proofed or something and the coolant just wont budge.
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post #4 of 8 Old 10-19-2007, 11:53 AM
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Assuming there's nothing wrong with your grip <grin> I can't say why you couldn't get the oil fill cap off - it's an ordinary RH thread, so turning it CCW (you ARE turning it CCW aren't you?) is what removes it.

Radiator drain should be simple too. But you've got to also remove the radiator pressure cap so the fluid can come out.
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post #5 of 8 Old 10-19-2007, 12:09 PM
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just clicking sounds like maybe the top plastic part of the cap broke off of the metal part and just the plastic piece is spinning

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post #6 of 8 Old 10-19-2007, 12:30 PM
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Have you tried pushing down on the oil cap and nudging it a little left and right? maybe nudging will get the cap to fall into slot so it can be loosened.

'02 WJ, Laredo Special Edition, 4.0L I6
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post #7 of 8 Old 10-19-2007, 02:31 PM
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this just happened to me when i changed my oil. the teeth inside the oil cap that make it so you cant over tighten it strip off and therefore makes it impossible to get it off (the right way that is). so the oil fill cap is actually 2 pieces. take a big flathead screwdriver and pry off the top piece... yes pry it off. it come off quite easily by just going around and prying the edges. once you get that off you will see the metal part that is actually the part that screws in. take a pair of vice grips and just turn it counterclockwise. this is the only way i have found to get the fill cap off until you get a new one. good luck.

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post #8 of 8 Old 10-19-2007, 04:51 PM
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For the coolant, it may be plugged a little. Get some wire and push it up through the drain **** and that might break up the clog. Good luck.

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